Based on https://derpibooru.org/861889

>Trixie opens her robe.
>The newly minted bimbo winces as she casts a critical eye on her unbelievable boobs.
>They aren't beach-balls. Not exactly.
>At least, they're not shaped like beach-balls.
>Their size however...
>She hold a hand up to her right breast with the palm facing inward.
>Her mind seethes at the unreal proportions reflected in the mirror.
>Unlike her friends she seems to realize that she hasn't always been this way.
>Remembers a time when she could palm her supple orbs and wrap her fingers around each boob.
>Now each of her hands barely cover her nipples and the surrounding pink patches of puckered flesh.
>Dropping the other side of her robe, Trixie places her left hand over her corresponding boob. 
>She looks on with awe and horror at her tremendous teats.
>They stand out from her chest so much that it drags her off balance sometimes when she turns too fast or leans too far over.
>Certainly the only reason she can walk upright is because her ample ass and broad hips give her some kind of ballast.
>What can she do? Everything about her now screams sex.
>She hears the name 'Titsie' in the back of her head.
>But she's not the Great and Pillowy Titsie. She's not!
>She tries to wrap her arms around her burgeoning bosom in a self hug.
>Her hands meet, but there's so much flesh to hold that she can't keep them there for long.
>Sighing in defeat she pulls her exquisitely manicured hands back and rests them on her areolas.
>Maybe she can harass that bitch Sparkle again or Sunset-
>The voluptuous girl makes the mistake of rubbing her palms against her boob's bulging bulls-eyes.
>Warm delight erupts from her nipples and oozes down her torso to her crotch.
>She tries to think, but her traitorous hands rub against her nubs again. 
>Hard.
>"Ah-AHHH!" she gasps.
>Pleasure pours out of her chest and conscious thought is banished except for a feeling of shame and defeat that, ironically, turns her on even more.
>Her spread fingers quickly come together around her rapidly hardening nips.
>The pink nubbins push out and Out and OUT as they thicken and swell to their full, engorged length.
>They grow a rosier shade of pink as she feels a hot blush course across her front.
>Again, that damnable dual reality.
>She knows that not too long ago she could rub the entirety of one of her nipples between just a thumb and forefinger.
>Now, after they've perked to their full size she needs a thumb and at least THREE fingers to hander one of her turgid tips.
>And handle them she does.
>She pulls and pinches as though trying to draw milk out of them.
>But the pale-haired bimbo isn't looking for a mother's sustenance.
>The statuesque slut is after a woman's pleasure.
>Soon, her jiggling jugs start to give her what she desires.
>Panting and sweating, she rubs and pushes against her bloated boobs, all while tweaking her stiff peaks.
>Squashing her tremendous teardrop shaped breasts against her chest and then seeing them rebound to their previous perkiness turn her on like nothing else and the dam in her mind and her pussy breaks.
>"Oh, OH, OHHH!!!" she squeals as her body convulses and she hunches over, her tits brushing up against her hips.
>Slowly, her breathing returns to normal.
>With a deliberate motion she releases her nipples and her breasts spring back to their normal resting place atop her chest.
>Through the haze of her post-orgasm she views her boobs.
>They're huge, beautiful and they feel like heaven.
>And she hates them.
>Well, maybe she doesn't...
>No! That's Titsie talking!
>Closing her robe, Trixie goes to find some clothes. 
>Then she's going to find Twilight Sparkle.
>And then she's either going to strangle that purple-haired menace or make out with her.

>End